<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert title="添加商品信息" type="info" center show-icon></el-alert>
      <!-- active 设置当前激活步骤 类型 number -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <!-- value/v-model绑定值，选中选项卡的 name 类型string -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <!-- 基本信息表单 -->
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 选择商品分类的级联选择器 -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cascaderProps"
                @change="cateChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传的后台API地址 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" @click="add" class="btnADD">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible">
      <img :src="previewPath" alt class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import 'quill/dist/quill.core.css'
import 'quill/dist/quill.snow.css'
import 'quill/dist/quill.bubble.css'

import { quillEditor } from "vue-quill-editor";
import _ from "lodash";
import { getCateList, getTabClicked } from "@/api/categories";
import { addGoods } from "@/api/goods";
export default {
  components: {
    quillEditor
  },
  data() {
    return {
      // 激活项
      activeIndex: "0",
      // 添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情信息
        goods_introduce: "",
        // 商品的参数（数组），包含 `动态参数` 和 `静态属性`
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" }
        ],
        good_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "请输入商品分类", trigger: "blur" }
        ]
      },
      // 商品分类列表
      cateList: [],
      // 配置选项
      cascaderProps: {
        // 次级菜单的展开方式
        expandTrigger: "hover",
        // 指定选项的值为选项对象的某个属性值
        value: "cat_id",
        // 指定选项标签为选项对象的某个属性值
        label: "cat_name",
        // 指定选项的子选项为选项对象的某个属性值
        children: "children"
      },
      // 动态参数列表数组
      manyTableData: [],
      // 静态属性列表数组
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      // 图片的url地址
      previewPath: "",
      // 图片预览展示
      previewVisible: false
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const res = await getCateList();
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类数据失败！");
      }
      this.cateList = res.data;
    },
    // 级联选择器选中项变化，会触发这个函数
    cateChange() {
      // 选中的,不是三级分类
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
        return;
      }
      // 证明选中的,是三级分类
      // console.log(this.addForm.goods_cat);
    },
    // 切换标签之前的钩子，若返回 false 或者返回 Promise 且被 reject，则阻止切换。
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择商品分类！");
        return false;
      }
    },
    async tabClicked() {
      // 判断访问的是商品参数面板
      if (this.activeIndex === "1") {
        const res = await getTabClicked({ cateId: this.cateId, sel: "many" });
        if (res.meta.status !== 200) {
          return this.$message.error("获取失败");
        }
        // 将得到的数据进行forEach循环，将字符串attr_vals，转换成数组
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        });
        this.manyTableData = res.data;
      } else if (this.activeIndex === "2") {
        const res = await getTabClicked({ cateId: this.cateId, sel: "only" });
        if (res.meta.status !== 200) {
          return this.$message.error("获取失败");
        }
        this.onlyTableData = res.data;
        /* console.log(this.onlyTableData) */
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 处理移除图片的操作
    handleRemove(file) {
      const filePath = file.response.data.tmp_path;
      const i = this.addForm.pics.findIndex(x => x.pic === filePath);
      this.addForm.pics.splice(i, 1);
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };
      // 2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async vaild => {
        if (!vaild) {
          return this.$message.error("请填写必要的表单项！");
        }
        // 执行添加的业务逻辑

        // 处理goods_cats属性 将数组转化为以 , 分隔的字符串
        // addForm需要表单双向绑定 用lodash 调用cloneDeep方法进行深拷贝
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");
        // 处理attrs参数

        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ")
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          };
          this.addForm.attrs.push(newInfo);
        });
        this.form = this.addForm.attrs;
        const res = await addGoods(form);
        if (res.meta.status !== 201) {
          return this.$message.error("添加失败");
        }
        this.$message.success("添加商品成功");
        this.$router.push("/goods");
      });
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  }
};
</script>
<style lang="scss" scoped>

.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnADD {
  margin-top: 15px;
}
</style>
